The Origins of Life on the Earth |
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Page 75
... t - RNA . for each amino acid , the interaction of an amino acid with its activating enzyme being highly specific . The amino acids after activation are next transferred to the terminal nucleotide of another special RNA , a low molec ...
... t - RNA . for each amino acid , the interaction of an amino acid with its activating enzyme being highly specific . The amino acids after activation are next transferred to the terminal nucleotide of another special RNA , a low molec ...
Page 76
... RNA Fig . 6-12 . A schematic outline of protein synthesis . The amino acid is attached to the transfer RNA after activation by ATP giving an amino acyl - t - RNA molecule . The amino acyl - t - RNAs enter the ribosome and the anticodon ...
... RNA Fig . 6-12 . A schematic outline of protein synthesis . The amino acid is attached to the transfer RNA after activation by ATP giving an amino acyl - t - RNA molecule . The amino acyl - t - RNAs enter the ribosome and the anticodon ...
Page 77
... t - RNA is not understood , but is believed to be concerned with maintaining a complicated three - dimensional structure . A little more must now be said about the anticodons in the t - RNAs . If the standard rules applied for pairing ...
... t - RNA is not understood , but is believed to be concerned with maintaining a complicated three - dimensional structure . A little more must now be said about the anticodons in the t - RNAs . If the standard rules applied for pairing ...
Contents
PREBIOTIC SYNTHESIS OF PURINES PYRIMIDINES | 8 |
THE COMPOSITION | 12 |
GEOLOGICAL EVIDENCE | 16 |
Copyright | |
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abundant active adenine alanine aldehydes amino acids ammonia ammonium amounts anticodon aqueous solution aspartic acid biochemical biological CaCO3 carbon CH₂ chain chemical chert CO₂ concentration condensation contain COOH cyanoacetylene cytosine decomposition dust cloud electric discharge energy enzyme equilibrium escape layer evolution example formaldehyde formation formed gases genetic geological glutamic acid glycine H₂ H₂N H₂O hydrocarbons hydrogen cyanide hydrolysis hydrolyzed important inorganic L. E. Orgel limestone living organisms material mechanism membranes metabolism meteorites methane minerals mixture molecules N₂ NH₂ nitrogen nucleic acids nucleotides O₂ obtained occur organic compounds origin oxidation oxygen pathways peptide phosphate phosphorylation photochemical photosynthesis planets polymers polynucleotides polypeptides prebiotic prebiotic synthesis Precambrian present pressure primitive atmosphere primitive earth primitive ocean purines reaction replication rocks Schopf Science sequence solar system structure sugars surface t-RNA temperature ultraviolet light volcanoes yield